1604711299981 has 2 divisors, whose sum is σ = 1604711299982. Its totient is φ = 1604711299980.

The previous prime is 1604711299979. The next prime is 1604711300009. The reversal of 1604711299981 is 1899921174061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1417171202500 + 187540097481 = 1190450^2 + 433059^2 .

It is an emirp because it is prime and its reverse (1899921174061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1604711299981 - 2¹ = 1604711299979 is a prime.

It is a super-2 number, since 2×1604711299981² (a number of 25 digits) contains 22 as substring.

Together with 1604711299979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1604711299951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802355649990 + 802355649991.

It is an arithmetic number, because the mean of its divisors is an integer number (802355649991).

Almost surely, 2^{1604711299981} is an apocalyptic number.

It is an amenable number.

1604711299981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604711299981 is an equidigital number, since it uses as much as digits as its factorization.

1604711299981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1959552, while the sum is 58.

The spelling of 1604711299981 in words is "one trillion, six hundred four billion, seven hundred eleven million, two hundred ninety-nine thousand, nine hundred eighty-one".